Class 9 Science Gravitation Extra Question Answer
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Q: What is the universal law of gravitation?
A: Every object in the universe attracts every other object with a force proportional to the product of their masses and inversely proportional to the square of the distance between them.
Q: What is the value of acceleration due to gravity (g) on Earth?
A: The value of g on Earth is approximately 9.8 m/s².
Q: Why is the weight of an object on the moon 1/6th of its weight on Earth?
A: Due to the moon’s smaller mass and radius compared to Earth, its gravitational pull is weaker, resulting in objects weighing 1/6th of their Earth weight.
Q: What is the difference between mass and weight?
A: Mass is the amount of matter in an object and remains constant everywhere, while weight is the gravitational force acting on the object and varies with location.
Q: What is free fall?
A: Free fall is the motion of an object when only gravitational force acts on it.
Q: What is thrust?
A: Thrust is the force acting perpendicular to a surface.
Q: How is pressure related to thrust?
A: Pressure is thrust per unit area (Pressure = Thrust/Area).
Q: State Archimedes’ principle.
A: When a body is immersed fully or partially in a fluid, it experiences an upward force equal to the weight of the fluid displaced by it.
Q: What determines whether an object will float or sink in a liquid?
A: The relative density of the object compared to the liquid – objects with density less than the liquid float, while those with greater density sink.
Q: What is buoyant force?
A: The upward force exerted by a fluid on an immersed object.
